10 man is harder as you can tell by how many 10 mans actually have kills, sorry you

doesn't mean anything. it's the first week and the first boss is incredibly difficult (arguably on par with the final boss, harder before the nerfs). most guilds do not want to skip it, and a large majority of the guilds that have killed it on 25man are big, well known guilds. I can't think of a single 10man guild that is renowned for getting world firsts/being outstanding at progress other than paragon. 10/25 is pretty balanced in mop dps etc wise, look at msv. the dps requirements for every fight were quite literally exactly the same (you needed to do 20 more dps per person on elegon heroic on 10man! game breaking, I know.)